fischer fixing-systems main-catalogue Page 647
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Basic knowledge of fastening technology Lightweight concrete solid block Aerated concrete 16 Lightweight concrete hollow block Expert tip · Before fixing in masonry, determine which brick type (designation, size, compressive strength) and mortar type (mortar category) has been used. · For safety anchoring in unknown or old masonry, pull out tests must be carried out on-site to determine the anchor load bearing capacity. · For fixings close to the edge, it is important to know if the wall is a load bearing wall as this prevents the risk of brick pull out. · Even solid brick can have holes (e. g. MZ, KS). The holes are mostly larger grip-holes in the centre of the brick (up to max. 15 % cavity proportion per brick). · Always drill without hammer function in perforated and hollow bricks. Here, special, sharply ground drills with hard metal tips are suitable. · Plaster or other non load-bearing layers may not be added to the load-bearing base and are not to be used in calculating the anchorage depth. · Avoid anchoring into masonry joints as much as possible due to joint inhomogeneity. If anchoring into a joint cannot be avoided (e. g. plaster on masonry) loads should be reduced. · For systems approved by building authorities, anchoring in joints (vertical or horizontal joints) is regulated in the approval notices. · For anchoring high loads in performated bricks, the anchorage depth should be increased. · Expansion fixings (e. g. FAZ II or FBN II) are not suitable for use in masonry due to its high expansion forces which may lead to cracks in the brick. Frame fixings are suitable due to its longer expansion part. · Bonded anchors achieve the highest possible loads in masonry. 647
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